Parts for your 2003 Honda Accord-Map sensor

2003 Honda Accord MAP Sensor — purpose, location, and servicing tips

Based on technical sources including the Honda Accord 2003 Factory Service Manual (PGM‑FI/Engine Controls section) and the Honda Electronic Parts Catalogue for the 2003 model year, the 2003 Honda Accord is fitted with a Manifold Absolute Pressure (MAP) sensor on both the 2.4‑litre four‑cylinder and the 3.0‑litre V6 petrol engines. The service manual details MAP sensor inputs and related OBD‑II diagnostics (DTCs P0106, P0107, P0108), and the parts catalogue lists a dedicated “Sensor, MAP” for these engines. So, the MAP sensor is relevant and used on this vehicle.

The MAP sensor on a 2003 Accord helps the engine computer figure out how much air is getting into the engine by measuring pressure in the intake manifold. With that info, it can set the right fuelling and ignition timing for smooth running, decent power, and good fuel economy. On these Accords, the system is “speed‑density”, which relies on the MAP sensor (rather than a traditional MAF) along with the throttle position and intake air temperature to do the maths.

When it’s healthy, drivers get clean take‑offs, stable idle, and tidy fuel use around town and on the open road. When it’s not, it can feel a bit doughy, run rich, idle roughly, or trigger the check‑engine light with a P0106‑P0108 code. Because the MAP sensor is crucial for mixture control, keeping it in good nick is worth it for both reliability and fuel costs.

For servicing a 2003 Accord, a quick visual under the bonnet is easy: the MAP sensor mounts on or near the intake manifold/throttle body and connects via a short plug and vacuum port. If there’s oil mist or grime, a gentle clean of the port and connector with electronics‑safe cleaner can help, but don’t soak the sensor or poke the diaphragm. If it’s throwing codes, stumbling under load, or showing implausible readings on a scan tool, replacement is usually the smarter play than repeated cleaning.

Handy tips owners appreciate:

• Check for split vacuum hoses or loose clamps before blaming the MAP sensor.
• Use a scan tool to confirm manifold pressure tracks throttle changes smoothly.
• When replacing, use quality OEM‑spec parts and reset fuel trims with a scan tool for best results.

Most home mechanics can swap a MAP sensor with basic tools, but if the car still surges or idles poorly afterwards, it’s worth a proper diagnostic to rule out vacuum leaks, EGR issues, or wiring faults.

Popular questions

Where is the MAP sensor on a 2003 Honda Accord?
On the 2.4‑litre four‑cylinder, it’s mounted on or just off the intake manifold near the throttle body. On the V6, it’s similarly placed on the upper intake plenum. It has a small electrical plug and a pressure port into the manifold.

What are the signs of a failing MAP sensor on this model?
Common clues include rough idle, sluggish acceleration, higher fuel use, and a check‑engine light with codes like P0106, P0107, or P0108. A scan tool will often show unstable or stuck manifold pressure readings compared to throttle input.

Does the 2003 Accord use a MAF as well?
No. The 2003 Accord petrol engines use a speed‑density strategy with a MAP sensor (and related inputs) rather than a mass air flow sensor. That’s documented in Honda’s service literature for this generation.